DRBD
DRBD是由内核模块和相关脚本而构成，用以构建高可用性的集群
drbd 工作原理：DRBD是一种块设备，可以被用于高可用(HA)之中.它类似于一个网络RAID-1功能。
当你将数据写入本地 文件系统时，数据还将会被发送到网络中另一台主机上。以相同的形式记录在一个
文件系统中。 本地(主节点)与远程主机(备节点)的数据可以保证实时同步。当本地系统出现故障时，远
程主机上还会保留有一份相同的数据，可以继续使用。在高可用(HA)中使用DRBD功能，可以代替使用一
个共享盘阵。因为数据同时存在于本地主机和远程主机上，切换时，远程主机只要使用它上面的那份备
份数据，就可以继续进行服务了。
DRBD主要功能：DRBD 负责接收数据，把数据写到本地磁盘，然后通过网络将同样的数据发送给另一
个主机，另一个主机再将数据存到自己的磁盘中。
DRBD 复制模式：
协议A：异步复制协议。本地写成功后立即返回，数据放在发送buffer中，可能丢失。
协议B：内存同步（半同步）复制协议。本地写成功并将数据发送到对方后立即返回，如果双机掉
电，数据可能丢失。
协议C：同步复制协议。本地和对方写成功确认后返回。如果双机掉电或磁盘同时损坏，则数据可能
丢失。
一般用协议C，但选择C协议将影响流量，从而影响网络时延。为了数据可靠性，我们在生产环境中
还是用C协议。
pacemaker+corosync
Corosync主要就是实现集群中Message layer层的功能：完成集群心跳及事务信息传递
Pacemaker主要实现的是管理集群中的资源（CRM）,真正启用、停止集群中的服务是RA（资源代理）
这个子组件。RA的类别有下面几种类型：
LSB：位于/etc/rc.d/init.d/*,至少支持start,stop,restart,status,reload,force-reload;
注意：不能开机自动运行；要有CRM来启动 //centos6用这种类型控制
OCF: /usr/lib/ocf/resource.d/provider/,类似于LSB脚本，但支持start，stop，status，
monitor，meta-data；
STONITH：调用stonith设备的功能
systemd：unit file，/usr/lib/systemd/system/ 注意：服务必须设置enable，开启自
启；//centos7支持
service：调用用户的自定义脚本
搭建环境
拓扑图
| 主机 | ip | 角色 | |
| centos-1 | 10.0.0.11 | drbd+mariadb+corosync+pacemaker | vip：10.0.0.100 |
| centos-2 | 10.0.0.12 | drbd+mariadb+corosync+pacemaker |
开始配置
1、先配置相关主机和相关时间同步服务器：
同步时间 [root@centos-1 ~]# yum install -y ntpdate [root@centos-1 ~]# crontab -e */5 * * * * ntpdate cn.pool.ntp.org [root@centos-2 ~]# crontab -e */5 * * * * ntpdate cn.pool.ntp.org 修改ssh互信 [root@centos-1 ~]# ssh-keygen [root@centos-1 ~]# ssh-copy-id 10.0.0.12 [root@centos-2 ~]# ssh-keygen [root@centos-2 ~]# ssh-copy-id 10.0.0.11 修改hosts文件保证hosts之间能够互相访问 [root@centos-1 ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 10.0.0.11 centos-1 10.0.0.12 centos-2 [root@centos-1 ~]# scp /etc/hosts 10.0.0.12:/etc/hosts
2、pcs集群的构建
2.1、在两个节点上执行：
[root@centos-1 ~]# yum install -y pacemaker pcs psmisc policycoreutils-python [root@centos-2 ~]# yum install -y pacemaker pcs psmisc policycoreutils-python
2.2、启动pcs并且让其开机自启：
[root@centos-1 ~]# systemctl start pcsd [root@centos-1 ~]# systemctl enable pcsd [root@centos-2 ~]# systemctl start pcsd [root@centos-2 ~]# systemctl enable pcsd
2.3、修改用户hacluster的密码：
[root@centos-1 ~]# echo 123456 | passwd --stdin hacluster [root@centos-2 ~]# echo 123456 | passwd --stdin hacluster
2.4、注册pcs集群主机（默认注册使用用户名hacluster）
[root@centos-1 ~]# pcs cluster auth centos-1 centos-2 Username: hacluster Password: centos-2: Authorized centos-1: Authorized
2.5、在集群上注册两台集群：
[root@centos-1 ~]# pcs cluster setup --name mycluster centos-5 centos-6 --force ##设置集群
2.6、在其中一个节点上查看已经生成的corosync配置文件
[root@centos-1 ~]# ls /etc/corosync/ corosync.conf corosync.conf.example.udpu uidgid.d corosync.conf.example corosync.xml.example ##可以看到生成有corosync.conf的配置文件
2.7、查看注册进来的配置文件
[root@centos-1 ~]# cat /etc/corosync/corosync.conf
totem {
version: 2
secauth: off
cluster_name: mycluster
transport: udpu
}
nodelist {
node {
ring0_addr: centos-1
nodeid: 1
}
node {
ring0_addr: centos-2
nodeid: 2
}
}
quorum {
provider: corosync_votequorum
two_node: 1
}
logging {
to_logfile: yes
logfile: /var/log/cluster/corosync.log
to_syslog: yes
}2.8、启动集群：
[root@centos-1 ~]# pcs cluster start --all ##相当于用来启动corosync和pacemaker centos-1: Starting Cluster... centos-2: Starting Cluster... ##查看是否启动成功 [root@centos-1 ~]# ps -ef | grep corosync root 2097 1 4 13:50 ? 00:00:00 corosync root 2114 996 0 13:50 pts/0 00:00:00 grep --color=auto corosync [root@centos-1 ~]# ps -ef | grep pacemaker root 2104 1 0 13:50 ? 00:00:00 /usr/sbin/pacemakerd -f haclust+ 2105 2104 0 13:50 ? 00:00:00 /usr/libexec/pacemaker/cib root 2106 2104 0 13:50 ? 00:00:00 /usr/libexec/pacemaker/stonithd root 2107 2104 0 13:50 ? 00:00:00 /usr/libexec/pacemaker/lrmd haclust+ 2108 2104 0 13:50 ? 00:00:00 /usr/libexec/pacemaker/attrd haclust+ 2109 2104 0 13:50 ? 00:00:00 /usr/libexec/pacemaker/pengine haclust+ 2110 2104 0 13:50 ? 00:00:00 /usr/libexec/pacemaker/crmd root 2138 996 0 13:51 pts/0 00:00:00 grep --color=auto pacemaker
2.9、查看集群的状态（显示为no faults即为OK）
[root@centos-1 ~]# corosync-cfgtool -s Printing ring status. Local node ID 1 RING ID 0 id = 10.0.0.11 status = ring 0 active with no faults [root@centos-2 ~]# corosync-cfgtool -s Printing ring status. Local node ID 2 RING ID 0 id = 10.0.0.12 status = ring 0 active with no faults
2.10、查看与集群相关的子节点的信息
[root@centos-1 ~]# corosync-cmapctl | grep members runtime.totem.pg.mrp.srp.members.1.config_version (u64) = 0 runtime.totem.pg.mrp.srp.members.1.ip (str) = r(0) ip(10.0.0.11) runtime.totem.pg.mrp.srp.members.1.join_count (u32) = 1 runtime.totem.pg.mrp.srp.members.1.status (str) = joined runtime.totem.pg.mrp.srp.members.2.config_version (u64) = 0 runtime.totem.pg.mrp.srp.members.2.ip (str) = r(0) ip(10.0.0.12) runtime.totem.pg.mrp.srp.members.2.join_count (u32) = 1 runtime.totem.pg.mrp.srp.members.2.status (str) = joined
2.11、查看当前集群的描述信息
[root@centos-1 ~]# pcs status Cluster name: mycluster WARNING: no stonith devices and stonith-enabled is not false ##在这里我们得实现隔离设备：stonith Stack: corosync ##底层是由哪个来传递信息的 Current DC: centos-1 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum ##DC指定的协调员（DC：是由所有节点选举出来的） Last updated: Mon Oct 30 13:52:14 2017 Last change: Mon Oct 30 13:51:00 2017 by hacluster via crmd on centos-1 2 nodes configured 0 resources configured Online: [ centos-1 centos-2 ] No resources ##还没有资源 Daemon Status: ##各守护进程准备正常 corosync: active/disabled pacemaker: active/disabled pcsd: active/enabled
2.12、配置全局选项
[root@centos-1 ~]# pcs property -h Usage: pcs property [commands]... Configure pacemaker properties ##查看哪项是可以配置的 [root@centos-1 ~]# pcs property list --all
2.13、查看集群是否有错误
[root@centos-1 ~]# crm_verify -L -V error: unpack_resources: Resource start-up disabled since no STONITH resources have been defined error: unpack_resources: Either configure some or disable STONITH with the stonith-enabled option error: unpack_resources: NOTE: Clusters with shared data need STONITH to ensure data integrity Errors found during check: config not valid ##出现这个错误是因为我们没有配置STONITH设备，所以，我们要关闭STONITH设备 [root@centos-1 ~]# pcs property set stonith-enabled=false [root@centos-1 ~]# crm_verify -L -V [root@centos-1 ~]# pcs property list Cluster Properties: cluster-infrastructure: corosync cluster-name: mycluster dc-version: 1.1.16-12.el7_4.4-94ff4df have-watchdog: false stonith-enabled: false ##现在就可以了
2.14、集群的话，我们可以通过下载安装crmsh来操作（从github上面来下载，然后解压并直接安装，我事先已经先下载好放在/usr/local/src下面了），只需要在其中一个节点上安装就可以了，在这里我在centos-1上配置crm :
[root@centos-1 src]# ls crmsh-2.3.2.tar [root@centos-1 src]# tar -xf crmsh-2.3.2.tar [root@centos-1 src]# cd crmsh-2.3.2 [root@centos-1 crmsh-2.3.2]# ls AUTHORS crm.conf.in NEWS TODO autogen.sh crmsh README.md tox.ini ChangeLog crmsh.spec requirements.txt update-data-manifest.sh configure.ac data-manifest scripts utils contrib doc setup.py version.in COPYING hb_report templates crm Makefile.am test [root@centos-1 crmsh-2.3.2]# python setup.py install
2.15、安装完成之后，我们可以查看一下集群的状态
[root@centos-1 ~]# crm status Stack: corosync Current DC: centos-1 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum Last updated: Mon Oct 30 13:55:40 2017 Last change: Mon Oct 30 13:53:49 2017 by root via cibadmin on centos-1 2 nodes configured 0 resources configured Online: [ centos-1 centos-2 ] No resources
到这里，pcs集群我们就已经配置好了，接下来就开始配置drbd和mariadb了。
3、配置drbd和mariadb
3.1、安装drbd
[root@centos-1 ~]# cd /etc/yum.repos.d/ [root@centos-1 yum.repos.d]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org [root@centos-1 yum.repos.d]# rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm [root@centos-1 yum.repos.d]# yum install -y kmod-drbd84 drbd84-utils [root@centos-2 ~]# cd /etc/yum.repos.d/ [root@centos-2 yum.repos.d]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org [root@centos-2 yum.repos.d]# rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm [root@centos-2 yum.repos.d]# yum install -y kmod-drbd84 drbd84-utils
3.2、配置drbd
##查看主配置文件
[root@centos-1 ~]# cat /etc/drbd.conf
# You can find an example in /usr/share/doc/drbd.../drbd.conf.example
include "drbd.d/global_common.conf";
include "drbd.d/*.res";
##配置全局文件
[root@centos-1 ~]# cd /etc/drbd.d/
[root@centos-1 drbd.d]# ls
global_common.conf
[root@centos-1 drbd.d]# cp global_common.conf global_common.conf.bak
[root@centos-1 drbd.d]# vim global_common.conf
global {
usage-count no; #是否参加DRBD使用统计，默认为yes。官方统计drbd的装机量
# minor-count dialog-refresh disable-ip-verification
}
common {
protocol C; #使用DRBD的同步协议
handlers {
pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b >
/proc/sysrq-trigger ; reboot -f";
pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b >
/proc/sysrq-trigger ; reboot -f";
local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh; echo o >
/proc/sysrq-trigger ; halt -f";
}
startup {
# wfc-timeout degr-wfc-timeout outdated-wfc-timeout wait-after-sb
}
options {
# cpu-mask on-no-data-accessible
}
disk {
on-io-error detach; #配置I/O错误处理策略为分离
# size max-bio-bvecs on-io-error fencing disk-barrier disk-flushes
# disk-drain md-flushes resync-rate resync-after al-extents
# c-plan-ahead c-delay-target c-fill-target c-max-rate
# c-min-rate disk-timeout
}
net {
# protocol timeout max-epoch-size max-buffers unplug-watermark
# connect-int ping-int sndbuf-size rcvbuf-size ko-count
# allow-two-primaries cram-hmac-alg shared-secret after-sb-0pri
# after-sb-1pri after-sb-2pri always-asbp rr-conflict
# ping-timeout data-integrity-alg tcp-cork on-congestion
# congestion-fill congestion-extents csums-alg verify-alg
# use-rle
}
syncer {
rate 1024M; #设置主备节点同步时的网络速率
}
}
注释： on-io-error 策略可能为以下选项之一
detach 分离：这是默认和推荐的选项，如果在节点上发生底层的硬盘I/O错误，它会将设备运行在Diskless无盘模式下
pass_on：DRBD会将I/O错误报告到上层，在主节点上，它会将其报告给挂载的文件系统，但是在此节点上就往往忽略（因此此节点上没有可
以报告的上层）
-local-in-error：调用本地磁盘I/O处理程序定义的命令；这需要有相应的local-io-error调用的资源处理程序处理错误的命令；这就给管
理员有足够自由的权力命令命令或是脚本调用local-io-error处理I/O错误
定义一个资源创建配置文件：
[root@centos-1 ~]# cat /etc/drbd.d/mysql.res
resource mysql { #资源名称
protocol C; #使用协议
meta-disk internal;
device /dev/drbd1; #DRBD设备名称
syncer {
verify-alg sha1;# 加密算法
}
net {
allow-two-primaries;
}
on centos-1 {
disk /dev/sdb1; #drbd1使用的磁盘分区为"mysql"
address 10.0.0.11:7789; #设置DRBD监听地址与端口
}
on centos-2 {
disk /dev/sdb1;
address 10.0.0.12:7789;
}
}
##把配置文件copy到对端
[root@centos-1 ~]# scp -rp /etc/drbd.d/* 10.0.0.12:/etc/drbd.d/在centos-1上启动
[root@centos-1 ~]# drbdadm create-md mysql initializing activity log initializing bitmap (96 KB) to all zero Writing meta data... New drbd meta data block successfully created. ##查看内核是否已经加载了模块 [root@centos-1 ~]# modprobe drbd [root@centos-1 ~]# lsmod | grep drbd drbd 396875 0 libcrc32c 12644 2 xfs,drbd [root@centos-1 ~]# drbdadm up mysql [root@centos-1 ~]# drbdadm -- --force primary mysql [root@centos-1 ~]# cat /proc/drbd version: 8.4.10-1 (api:1/proto:86-101) GIT-hash: a4d5de01fffd7e4cde48a080e2c686f9e8cebf4c build by mockbuild@, 2017-09-15 14:23:22 1: cs:WFConnection ro:Primary/Unknown ds:UpToDate/DUnknown C r----s ns:0 nr:0 dw:0 dr:912 al:8 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:3144572
在对端节点执行
[root@centos-2 ~]# drbdadm create-md mysql [root@centos-2 ~]# modprobe drbd [root@centos-2 ~]# drbdadm up mysql
可以看到数据同步的状态
[root@centos-1 ~]# cat /proc/drbd version: 8.4.10-1 (api:1/proto:86-101) GIT-hash: a4d5de01fffd7e4cde48a080e2c686f9e8cebf4c build by mockbuild@, 2017-09-15 14:23:22 1: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r----- ns:1798144 nr:0 dw:0 dr:1799056 al:8 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:1346428 [==========>.........] sync'ed: 57.3% (1346428/3144572)K finish: 0:00:32 speed: 40,732 (39,088) K/sec
格式化drbd1并挂载
[root@centos-1 ~]# mkfs.ext4 /dev/drbd1 [root@centos-1 ~]# systemctl start drbd You have new mail in /var/spool/mail/root [root@centos-1 ~]# systemctl enable drbd [root@centos-1 ~]# drbdadm -- --overwrite-data-of-peer primary mysql [root@centos-1 ~]# drbd-overview NOTE: drbd-overview will be deprecated soon. Please consider using drbdtop. 1:mysql/0 Connected Primary/Secondary UpToDate/UpToDate [root@centos-1 ~]# mkdir /data ##创建mariadb数据库的数据存放目录 [root@centos-1 ~]# mount /dev/drbd1 /data
3.3、安装mariadb
##这里使用yum安装 [root@centos-1 ~]# yum install -y mariadb mariadb-server [root@centos-2 ~]# yum install -y mariadb mariadb-server ##修改目录权限 [root@centos-1 ~]# chown -R mysql:mysql /data ##修改权限 [root@centos-1 ~]# vim /etc/my.cnf ##修改数据目录到/data目录下 [mysqld] datadir=/data socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 # Settings user and group are ignored when systemd is used. # If you need to run mysqld under a different user or group, # customize your systemd unit file for mariadb according to the # instructions in http://fedoraproject.org/wiki/Systemd [mysqld_safe] log-error=/var/log/mariadb/mariadb.log pid-file=/var/run/mariadb/mariadb.pid # # include all files from the config directory # !includedir /etc/my.cnf.d
3.4、测试数据库挂载是否成功
启动数据库 [root@centos-1 ~]# systemctl start mariadb [root@centos-1 ~]# cd /data/ [root@centos-1 data]# ls aria_log.00000001 ibdata1 ib_logfile1 mysql test aria_log_control ib_logfile0 lost+found performance_schema ##可以看到/data目录下已经有数据了 在数据库里创建一个数据库作为测试使用 [root@centos-1 data]# mysql Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 2 Server version: 5.5.56-MariaDB MariaDB Server Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MariaDB [(none)]> create database centos_test; ##创建测试数据库 Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> show databases; +---------------------+ | Database | +---------------------+ | information_schema | | centos_test | | #mysql50#lost+found | | mysql | | performance_schema | | test | +---------------------+ 6 rows in set (0.00 sec)
测试让centos-2为主，然后挂载磁盘
##在centos-1上关闭mariadb并对drbd降级 [root@centos-1 data]# systemctl stop mariadb [root@centos-1 data]# umount /data/ [root@centos-1 ~]# drbdadm secondary mysql [root@centos-1 ~]# drbd-overview NOTE: drbd-overview will be deprecated soon. Please consider using drbdtop. 1:mysql/0 Connected Secondary/Secondary UpToDate/UpToDate ##在centos-2上设置为主，并启动mariadb，查看一下数据 [root@centos-2 ~]# mkdir /data [root@centos-2 ~]# chown -R mysql:mysql /data [root@centos-2 ~]# drbdadm primary mysql [root@centos-2 ~]# drbd-overview NOTE: drbd-overview will be deprecated soon. Please consider using drbdtop. 1:mysql/0 Connected Primary/Secondary UpToDate/UpToDate [root@centos-2 ~]# mount /dev/drbd1 /data [root@centos-2 ~]# systemctl start mariadb [root@centos-2 ~]# cd /data/ [root@centos-2 data]# ls aria_log.00000001 centos_test ib_logfile0 lost+found performance_schema aria_log_control ibdata1 ib_logfile1 mysql test [root@centos-2 data]# mysql Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 2 Server version: 5.5.56-MariaDB MariaDB Server Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MariaDB [(none)]> show databases; +---------------------+ | Database | +---------------------+ | information_schema | | centos_test | | #mysql50#lost+found | | mysql | | performance_schema | | test | +---------------------+ 6 rows in set (0.07 sec) ##测试没问题，现在我们把主从切换回来 [root@centos-2 ~]# systemctl stop mariadb [root@centos-2 ~]# umount /data [root@centos-2 ~]# drbdadm secondary mysql [root@centos-2 ~]# systemctl stop drbd [root@centos-1 ~]# drbdadm primary mysql [root@centos-1 ~]# systemctl stop drbd
4、配置crm资源
4.1、开始定义资源
[root@centos-1 ~]# crm crm(live)# configure crm(live)configure# primitive mysqldrbd ocf:linbit:drbd params drbd_resource=mysql op start timeout=240 op stop timeout=100 op monitor role=Master interval=20 timeout=30 op monitor role=Slave interval=30 timeout=30 crm(live)configure# verify crm(live)configure# ms ms_mysqldrbd mysqldrbd meta master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 notify=true crm(live)configure# verify crm(live)configure# commit crm(live)configure# cd crm(live)# status Stack: corosync Current DC: centos-1 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum Last updated: Mon Oct 30 14:58:13 2017 Last change: Mon Oct 30 14:58:06 2017 by root via cibadmin on centos-1 2 nodes configured 2 resources configured Online: [ centos-1 centos-2 ] Full list of resources: Master/Slave Set: ms_mysqldrbd [mysqldrbd] Masters: [ centos-2 ] Slaves: [ centos-1 ] ##可以看到主从已经有资源了
4.2、添加文件系统资源
crm(live)# configure crm(live)configure# primitive mystore ocf:heartbeat:Filesystem params device=/dev/drbd1 directory=/data fstype=ext4 op start timeout=60 op stop timeout=60 crm(live)configure# verify crm(live)configure# colocation mystore_with_ms_mysqldrbd inf: mystore ms_mysqldrbd:Master crm(live)configure# verify crm(live)configure# order mystore_after_ms_mysqldrbd mandatory: ms_mysqldrbd:promote mystore:start crm(live)configure# verify crm(live)configure# commit crm(live)configure# cd crm(live)# status Stack: corosync Current DC: centos-1 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum Last updated: Mon Oct 30 15:05:21 2017 Last change: Mon Oct 30 15:05:13 2017 by root via cibadmin on centos-1 2 nodes configured 3 resources configured Online: [ centos-1 centos-2 ] Full list of resources: Master/Slave Set: ms_mysqldrbd [mysqldrbd] Masters: [ centos-2 ] Slaves: [ centos-1 ] mystore (ocf::heartbeat:Filesystem): Started centos-2 ##注意，在增加资源顺序约束时（order mysql_after_mystore Mandatory: mystore mysqld），要先加mystore ，再到mysql，不然文件转换不过来。
4.3、增加MySQL资源
crm(live)# configure crm(live)configure# primitive mysqld systemd:mariadb crm(live)configure# colocation mysqld_with_mystore inf: mysqld mystore crm(live)configure# verify WARNING: mysqld: default timeout 20s for start is smaller than the advised 100 ##这个错误可以忽略不计，只是我们设的timeout时间比它默认的要低 WARNING: mysqld: default timeout 20s for stop is smaller than the advised 100 crm(live)configure# commit WARNING: mysqld: default timeout 20s for start is smaller than the advised 100 WARNING: mysqld: default timeout 20s for stop is smaller than the advised 100 crm(live)configure# cd crm(live)# status Stack: corosync Current DC: centos-1 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum Last updated: Mon Oct 30 15:07:58 2017 Last change: Mon Oct 30 15:07:47 2017 by root via cibadmin on centos-1 2 nodes configured 4 resources configured Online: [ centos-1 centos-2 ] Full list of resources: Master/Slave Set: ms_mysqldrbd [mysqldrbd] Masters: [ centos-2 ] Slaves: [ centos-1 ] mystore (ocf::heartbeat:Filesystem): Started centos-2 mysqld (systemd:mariadb): Started centos-2
4.4、增加vip资源
crm(live)# configure crm(live)configure# primitive myvip ocf:heartbeat:IPaddr params ip="10.0.0.100" op monitor interval=20 timeout=20 on- fail=restart crm(live)configure# colocation vip_with_ms_mysqldrbd inf: ms_mysqldrbd:Master myvip crm(live)configure# verify WARNING: mysqld: default timeout 20s for start is smaller than the advised 100 WARNING: mysqld: default timeout 20s for stop is smaller than the advised 100 crm(live)configure# commit
4.5、查看最终配置好的资源和状态
5、测试
5.1、先使用本地ip去查看数据库
##可以看到原来创的数据库centos_test还在，现在我们给这个数据库写一张表test进去，然后使用vip登录，看看能不能看到数据库centos_test和表test。
5.2、使用vip登录数据库
##可以发现跟我们使用本地ip登录时，看到的是一样的，然后看看能不能创表或者创数据库
##创建表成功。
5.3、当centos-1宕机了，centos-1上的服务会转移到centos-2上，所有服务都还能正常运行
##切换成功，现在到centos-2上去看看mariadb服务是否正常运行
##可以看到vip已经切换过来了，而且在centos-1上创建的数据库也能看到
这次的drbd+corosync+pacemaker+MySQL构建高可用的实验就完成了，如果有写错的地方，欢迎各位大神指出来，我会去修改的。如果有写得不好的地方，请多多见谅！！！
drbd+mariadb+corosync+pacemaker构建高可用，实现负载均衡
原文地址：http://blog.51cto.com/3381847248/2053170
